<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>检查一个字符串是否包含所有长度为 K 的二进制子串</title>
</head>
<body>
  <script>
    function fn(s, k) {
      let numfn, sear;
      for (let i = 0; i <= Math.pow(2, k) - 1; i++) {
        num = i.toString(2);
        sear = "0".repeat(k - num.length) + num;
        if (s.indexOf(sear) == -1)
          return false;
      }
      return true;
    }
    console.log(fn('00110110', 2))
  </script>
</body>
</html>